| begin to hurt(verb, health, illness) |
| break down(verb, phrasal verb, condition, worsening) |
| catch a cold(verb, expression, idiom, health, illness) |
| catch a disease(verb, expression, idiom, health, illness) |
| catch an illness(verb, expression, idiom, health, illness) |
| change for the worse(verb, condition, worsening) |
| come down(health, illness, verb, phrasal verb, american) |
| contract a disease(health, illness, expression) |
| contract an illness(health, illness, expression) |
| decay(noun, verb, condition, worsening) |
| decline(noun, verb, condition, worsening) |
| degenerate(condition, worsening, noun, verb, adjective) |
| develop illnesses(expression, health, illness) |
| disease(noun, verb, health, illness) |
| disimprove(verb, condition, worsening) |
| dwindle(verb, condition, worsening) |
| fall ill(health, illness, verb) |
| fall sick(health, illness, verb) |
| get an illness(verb, health, illness) |
| get ill(verb, health, illness) |